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CN-122000697-A - Single cell body and lattice metamaterial structure

CN122000697ACN 122000697 ACN122000697 ACN 122000697ACN-122000697-A

Abstract

The embodiment of the application provides a single cell body and lattice metamaterial structure. The unit cell comprises an outer frame, a supporting component and a supporting component, wherein the outer frame is of a cube structure and comprises three groups of opposite surfaces, each surface is provided with two groups of opposite sides, two surfaces belong to the same group are arranged on the outer frame, a group of sides of one surface are provided with connecting convex beams extending along the sides, a corresponding group of sides of the other surface are provided with connecting grooves extending along the sides, the cross section of each connecting groove is non-circular and is of a continuous arc shape, each connecting convex beam is provided with an embedded part, the shape of each embedded part is matched with the cross section of each connecting groove, and the supporting component is arranged in a space enclosed by the outer frame and is used for supporting the outer frame. The single cell body provided by the application realizes high-precision rapid assembly and multidirectional mechanical property reinforcement of a lattice metamaterial structure by combining a convex-concave matching design of an elliptic geometric configuration and a directional interlocking mechanism of a modularized single cell.

Inventors

  • YIN SHA
  • MA CHAO
  • ZHU ZIHAO
  • WANG HUITIAN

Assignees

  • 北京航空航天大学

Dates

Publication Date
20260508
Application Date
20260206

Claims (10)

  1. 1. A unit cell for assembling lattice metamaterial structures, the unit cell comprising: The outer frame is of a cube structure and comprises three groups of opposite surfaces, each surface is provided with two groups of opposite sides, two surfaces belong to the same group, one group of sides of one surface is provided with a connecting convex beam extending along the sides, the corresponding group of sides of the other surface is provided with a connecting groove extending along the sides, the section of the connecting groove is non-circular and is of a continuous arc shape, the connecting convex beam is provided with an embedded part, and the shape of the embedded part is matched with the shape of the section of the connecting groove; and the supporting component is arranged in the space enclosed by the outer frame and is used for supporting the outer frame.
  2. 2. The unit cell according to claim 1, wherein the cross section of the connecting groove and the embedded portion is elliptical.
  3. 3. The unit cell according to claim 2, wherein the connecting boss further comprises a base portion for connecting with the outer frame, and an outer peripheral wall of the base portion is connected with an outer peripheral wall of the insertion portion and smoothly transits.
  4. 4. The unit cell according to claim 2, wherein said oval shape has a major axis and a minor axis, and wherein the ratio of the length of said major axis to the length of said minor axis is 1.5-3.
  5. 5. The unit cell according to any one of claims 1 to 4, wherein the outer frame comprises front and rear surfaces opposed in the front-rear direction, left and right surfaces opposed in the left-right direction, and upper and lower surfaces opposed in the up-down direction; the left side edge and the right side edge of the front surface are respectively provided with a connecting convex beam extending along the up-down direction; the front side edge and the rear side edge of the right surface are respectively provided with a connecting groove extending along the up-down direction; the front side and the rear side of the upper surface are respectively provided with a connecting convex beam extending along the left-right direction.
  6. 6. The unit cell according to any one of claims 1 to 4, wherein the outer frame comprises front and rear surfaces opposed in the front-rear direction, left and right surfaces opposed in the left-right direction, and upper and lower surfaces opposed in the up-down direction; the left side edge and the right side edge of the front surface are respectively provided with a connecting convex beam extending along the up-down direction; the front side edge and the rear side edge of the right surface are respectively provided with a connecting groove extending along the up-down direction; the left side and the right side of the upper surface are respectively provided with a connecting convex beam extending along the front-back direction.
  7. 7. The unit cell according to any one of claims 1 to 4, wherein the outer frame comprises front and rear surfaces opposed in the front-rear direction, left and right surfaces opposed in the left-right direction, and upper and lower surfaces opposed in the up-down direction; the left side edge and the right side edge of the front surface are respectively provided with a connecting convex beam extending along the up-down direction; the upper side and the lower side of the right surface are respectively provided with a connecting groove extending along the front-back direction; the front side and the rear side of the upper surface are respectively provided with a connecting convex beam extending along the left-right direction.
  8. 8. The unit cell according to claim 1, wherein the support member comprises a plurality of support columns corresponding to corners of the outer frame, the plurality of support columns extending from the corresponding corners toward a geometric center of the outer frame and being connected.
  9. 9. A lattice metamaterial structure is characterized by comprising a plurality of unit cells according to any one of claims 1-8, wherein two opposite surfaces of the unit cells belonging to two adjacent unit cells are connected through connecting protrusions Liang Qian arranged in the connecting grooves.
  10. 10. The lattice metamaterial structure of claim 9, wherein the lattice metamaterial structure comprises at least one of a first class of unit cells, a second class of unit cells, and a third class of unit cells; The front side and the rear side of the right surface are respectively provided with a connecting groove extending in the up-down direction, and the front side and the rear side of the upper surface are respectively provided with a connecting convex beam extending in the left-right direction; The left side and the right side of the front surface of the second type unit cell body are respectively provided with a connecting convex beam extending along the up-down direction, the front side and the rear side of the right surface are respectively provided with a connecting groove extending along the up-down direction, and the left side and the right side of the upper surface are respectively provided with a connecting convex beam extending along the front-down direction; The left side and the right side of the front surface of the third type unit cell body are respectively provided with a connecting convex beam extending along the up-down direction, the upper side and the lower side of the right surface are respectively provided with a connecting groove extending along the front-back direction, and the front side and the rear side of the upper surface are respectively provided with a connecting convex beam extending along the left-right direction.

Description

Single cell body and lattice metamaterial structure Technical Field The application relates to the technical field of lattice metamaterials, in particular to a single cell body and lattice metamaterials structure. Background With the deep activities of human aerospace exploration and space utilization, large space structures, such as space solar power stations, large space telescopes and the like, are built and maintained on orbit, and become a necessary trend of future space technology development. Meanwhile, in the field of ground application, the lattice metamaterial has wide prospect in the fields of aerospace, advanced equipment, advanced vehicles and the like due to the light weight, high specific strength/rigidity and multifunctional integrated design potential. However, the prior art faces significant challenges in macroscopic manufacturing of lattice metamaterial structures with large size or complex geometric configuration, on one hand, additive manufacturing can directly form complex microstructures, but has the problems of low efficiency, high cost, limited material selection and potential precision in manufacturing large-scale components, and on the other hand, the modular assembly strategy can avoid size limitation and realize regional customization, but the traditional single-cell splicing method such as bolting, gluing or simple mortise-tenon matching is difficult to simultaneously meet the requirements of high-precision positioning, rapid and efficient assembly, stable and reliable mechanical interlocking and the like. Especially, the mechanical interlocking design of the conventional rectangular or circular concave-convex structure is difficult to meet the actual requirement, and limits the application scene of the lattice metamaterial structure. Disclosure of Invention The application provides a single cell body and a lattice metamaterial, which realizes high-precision rapid assembly and multidirectional mechanical property reinforcement of a lattice metamaterial structure by combining a directional interlocking mechanism of a modularized single cell through convex-concave matching design of an elliptic geometric configuration. The application provides a single cell body for a spliced dot matrix metamaterial structure, which comprises an outer frame, a supporting component and a connecting component, wherein the outer frame is of a cube structure and comprises three groups of opposite surfaces, each surface is provided with two groups of opposite sides, two surfaces belong to one group, one group of sides of one surface are provided with connecting convex beams extending along the sides, the corresponding group of sides of the other surface are provided with connecting grooves extending along the sides, the cross section of the connecting grooves is non-circular and is of a continuous arc shape, the connecting convex beams are provided with embedded parts, the cross section of the embedded parts are matched with the cross section of the connecting grooves, and the supporting component is arranged in a space enclosed by the outer frame and is used for supporting the outer frame. According to the single cell body, the embedded part of the connecting convex beam is matched with the connecting groove, so that the self-guiding accurate positioning and the rapid and efficient assembly among the single cell bodies can be realized, meanwhile, strong and reliable mechanical interlocking can be formed, multiple loads can be effectively resisted, and the stability of the overall mechanical property is improved. In addition, the lattice metamaterial structure can be assembled through the unit cell body, so that the lattice metamaterial structure has expansibility, the problem of macroscopic manufacturing of large-size or complex geometric lattice metamaterials in the prior art is solved, the manufacturing process is simplified, and the manufacturing cost is reduced. In some embodiments, the cross-section of the attachment recess and the insert are both elliptical. In some embodiments, the connecting convex beam further comprises a base body part, wherein the base body part is used for being connected with the outer frame, and the peripheral wall of the base body part is connected with the peripheral wall of the embedded part and smoothly transits. In some embodiments, the ellipse has a major axis and a minor axis, the ratio of the length of the major axis to the length of the minor axis being 1.5-3. In some embodiments, the outer frame comprises a front surface, a rear surface, a left surface, a right surface and an upper surface, wherein the front surface and the rear surface are opposite in the front-back direction, the left surface and the right surface are opposite in the left-right direction, and the upper surface and the lower surface are opposite in the up-down direction; the front side and the rear side of the right surface are respectively provided with a connecting groove extending along th